3Com Switch 7750 Configuration Guide Guide

460 CHAPTER 45: MSDP CONFIGURATION

Solution

1 Check the connectivity of the route between the routers. Use the display ip

routing-table command to check that the unicast route between the routers is

correct.

2 Further check that a unicast route exists between two routers that will become

MSDP peers and that the route leads to the two peers.

3 Check that the interface addresses of the MSDP peers are consistent. Use the

display current-configuration command to check that the address of the local

connect-interface interface is consistent with the address of the corresponding

MSDP peer.

No SA Entry in the SA

Cache of the Router

Symptom

An MSDP fails to send (S, G) forwarding entries through an SA message.

Analysis

You can use the import-source command to send the (S, G) entries of the local

multicast domain to the neighboring MSDP peer through SA messages. The acl

keyword is optional. If you do not use this keyword, all (S, G) entries will be filtered

out by default, that is, none of the (S, G) entries in the local multicast domain will

be advertised. Before the import-source command is executed, the system will

send all (S, G) entries in the local multicast domain. If the MSDP fails to send the

(S, G) entries of the local multicast domain through SA messages, verify that the

import-source command is configured correctly.